#include<stdio.h>
#include<unistd.h>

extern char **environ;

int main()
{
    
        //execl("/usr/bin/ls","ls" , NULL);
        //execlp("ls","ls",NULL);
        //execle("/usr/bin/ls","ls",NULL,environ);


         char * const arr[] = {"pwd",NULL};
        // execv("/usr/bin/pwd",arr);
        execve("/usr/bin/pwd",arr,environ);

    return 0;
}